- Email: [email protected]
Field scale patterns of soil water storage from non-contacting measurement of bulk electrical conductivity. Note
230A 914243 Recent developments in Urban Geology de Mulder, E F J Proc 6th International Congress International Association of
scales less than 40m. At scales greater than this, electrical conductivity explained more than 80% of water storage variation. The use of the induction meter may thus be a simple and rapid method of assessing general patterns of water storage in soils.
Engineering Geology, Amsterdam, 6-10 August 1990 VI, P585-591. Publ Rotterdam: A A Balkema, 1990 The state of the art of this relatively new branch of the earth sciences is described. It deals specifically with availability of data in urban areas, site investigation, and correlation of engineering geology data in cities. Complications are introduced by the presence of existing structures which limits availability of observation points, uneven surface loadings, and the presence of irregularly placed and uncharted fills. Cooperation between planners and geologists is essential. Recent advances in data acquisition and manipulation have assisted urban geologists. 914244 Geological and geotechnical characterization of the morainic 'Ampitheater of Rivoli' in NW Italy Eusebio, A; Rabbi, E; Grasso, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P601-608. Publ Rotter&rot." A A Balkema, 1990 A thick glacial sequence including a major morainic structure, predominantly gravel, is found in the Susa valley. Tunnelling in this cohesionless mass is problematic. Geotechnical characterisation to obtain input parameters for engineering design is described. Engineering geological mapping, borehole logging, static and dynamic penetration tests, and extensive laboratory tests were carried out. Results are presented and discussed. 914245 Suggested approach to ground investigation and the determination of suitable substructure solutions for sites underlain by chalk Edmonds, C N; Kirkwood, J P Proc International Chalk Symposium, Brighton. 4-7 September 1989 P169-177. Publ London." Thomas Telford, 1990 Foundation design on chalk is complicated by presence of filled or unfilled underground voids, which must be detected and mapped at early stages in a project. A suggested site investigation procedure includes: desk study to review documented site history; aerial photography; geomorphological mapping; mapping of detected and surveyed natural and artificial cavities, geology, and hydrology; application of subsidence hazard mapping formulae; and final production of a subsidence hazard map. Foundation options are outlined. Case studies are illustrated.
Geophysical techniques 914246 Field scale patterns of soil water storage from non-contacting measurement of bulk electrical conductivity. Note Kaehanoski, R G; de Jong, E; Van Wesenbeeck, I J Can J Soil Sci VTO. N3. Aug 1990. P537-541 Soil water storage (0-1.7m) was measured at 10m intervals along a 660m transect using a neutron probe, and compared to electrical conductivity measurements made using a noncontacting electromagnetic induction meter. Spatial coherency analysis for the two variables showed lack of correlation at
914247 Locating lagoon seepage with radar and electromagnetic survey Brune, D E: Doolittle, J Environ Geol Water Sci V16. ,V3. Nov-Dec 1990, P195-207 The use of ground penetrating radar and electromagnetic terrain conductivity surveys to determine the presence of and extent of groundwater contamination resulting from leachate plumes at 3 waste lagoon sites is described. Initial results indicate the EM technique to possess greater range of applicability, being less site specific and operator dependent than GPR. 914248 Geostatistical simulation for geophysical applications - Part II: Geophysical modeling Shive, P N; Lowry, T; Easley, D H; Borgman, L E Geophysics 1/55, Nil, Nov 1990. PI441-1446 A shallow karst environment has been simulated using previously described geostatistical techniques (ibid, V55, N i l , P1435-1440). Distributions of seismic velocity, density, resistivity, and dielectric constant are synthesised. Hypothetical geophysical surveys of the model were run using seismic refraction, microgravity, dc resistivity, and ground probing radar techniques. Physical properties appropriate to cavities were then introduced and the surveys repeated in order to evaluate the potential of the various methods for cavity location. Anomalies caused by natural variations may mask those due to target features. 914249 Clay mineralogy and pressure analysis from seismic information in Krishna-Godavari basin, India Basu, S Geophysics I/'55, Nl l, Nov 1990. P1447-1454 Commercial success has not been achieved in this offshore/onshore basin in the Bay of Bengal. Importance of overpressure zones in preventing hydrocarbon entry is suspected as one cause. To examine this further, large scale seismic exploration (22000 sq km) was carried out. Compaction trends were established from rms seismic velocities, and calibrated with those from well logs. Trends were correlated with clay types derived from mineralogical analysis. This was used to predict clay types from trends in undrilled areas and infer presence of overpressure and source rock potential. 914250 Geoelectrical investigation for ground water in crystalline terrains of central Bahia, Brazil Medeiros, W E; de Lima, O A L Ground Water 1/28, N4, July-Aug 1990, P518-523 In crystalline terrains, the best locations for-wells are in narrow, deeply fractured and altered belts, normally associated with fault zones or folding axes. An electrical procedure, based on vertical soundings and multiple resistivity profiles, has been used to map these essentially 2-dimensional structures in Brazil. Detailed description of the lateral and vertical extent of these fractured aquifers and some hydrological properties can be obtained. Data acquisition and data processing using a finite difference algorithm are described.
D 199t Pergamon Press plc. Reproduction not permitted
scales less than 40m. At scales greater than this, electrical conductivity explained more than 80% of water storage variation. The use of the induction meter may thus be a simple and rapid method of assessing general patterns of water storage in soils.
Engineering Geology, Amsterdam, 6-10 August 1990 VI, P585-591. Publ Rotterdam: A A Balkema, 1990 The state of the art of this relatively new branch of the earth sciences is described. It deals specifically with availability of data in urban areas, site investigation, and correlation of engineering geology data in cities. Complications are introduced by the presence of existing structures which limits availability of observation points, uneven surface loadings, and the presence of irregularly placed and uncharted fills. Cooperation between planners and geologists is essential. Recent advances in data acquisition and manipulation have assisted urban geologists. 914244 Geological and geotechnical characterization of the morainic 'Ampitheater of Rivoli' in NW Italy Eusebio, A; Rabbi, E; Grasso, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 VI, P601-608. Publ Rotter&rot." A A Balkema, 1990 A thick glacial sequence including a major morainic structure, predominantly gravel, is found in the Susa valley. Tunnelling in this cohesionless mass is problematic. Geotechnical characterisation to obtain input parameters for engineering design is described. Engineering geological mapping, borehole logging, static and dynamic penetration tests, and extensive laboratory tests were carried out. Results are presented and discussed. 914245 Suggested approach to ground investigation and the determination of suitable substructure solutions for sites underlain by chalk Edmonds, C N; Kirkwood, J P Proc International Chalk Symposium, Brighton. 4-7 September 1989 P169-177. Publ London." Thomas Telford, 1990 Foundation design on chalk is complicated by presence of filled or unfilled underground voids, which must be detected and mapped at early stages in a project. A suggested site investigation procedure includes: desk study to review documented site history; aerial photography; geomorphological mapping; mapping of detected and surveyed natural and artificial cavities, geology, and hydrology; application of subsidence hazard mapping formulae; and final production of a subsidence hazard map. Foundation options are outlined. Case studies are illustrated.
Geophysical techniques 914246 Field scale patterns of soil water storage from non-contacting measurement of bulk electrical conductivity. Note Kaehanoski, R G; de Jong, E; Van Wesenbeeck, I J Can J Soil Sci VTO. N3. Aug 1990. P537-541 Soil water storage (0-1.7m) was measured at 10m intervals along a 660m transect using a neutron probe, and compared to electrical conductivity measurements made using a noncontacting electromagnetic induction meter. Spatial coherency analysis for the two variables showed lack of correlation at
914247 Locating lagoon seepage with radar and electromagnetic survey Brune, D E: Doolittle, J Environ Geol Water Sci V16. ,V3. Nov-Dec 1990, P195-207 The use of ground penetrating radar and electromagnetic terrain conductivity surveys to determine the presence of and extent of groundwater contamination resulting from leachate plumes at 3 waste lagoon sites is described. Initial results indicate the EM technique to possess greater range of applicability, being less site specific and operator dependent than GPR. 914248 Geostatistical simulation for geophysical applications - Part II: Geophysical modeling Shive, P N; Lowry, T; Easley, D H; Borgman, L E Geophysics 1/55, Nil, Nov 1990. PI441-1446 A shallow karst environment has been simulated using previously described geostatistical techniques (ibid, V55, N i l , P1435-1440). Distributions of seismic velocity, density, resistivity, and dielectric constant are synthesised. Hypothetical geophysical surveys of the model were run using seismic refraction, microgravity, dc resistivity, and ground probing radar techniques. Physical properties appropriate to cavities were then introduced and the surveys repeated in order to evaluate the potential of the various methods for cavity location. Anomalies caused by natural variations may mask those due to target features. 914249 Clay mineralogy and pressure analysis from seismic information in Krishna-Godavari basin, India Basu, S Geophysics I/'55, Nl l, Nov 1990. P1447-1454 Commercial success has not been achieved in this offshore/onshore basin in the Bay of Bengal. Importance of overpressure zones in preventing hydrocarbon entry is suspected as one cause. To examine this further, large scale seismic exploration (22000 sq km) was carried out. Compaction trends were established from rms seismic velocities, and calibrated with those from well logs. Trends were correlated with clay types derived from mineralogical analysis. This was used to predict clay types from trends in undrilled areas and infer presence of overpressure and source rock potential. 914250 Geoelectrical investigation for ground water in crystalline terrains of central Bahia, Brazil Medeiros, W E; de Lima, O A L Ground Water 1/28, N4, July-Aug 1990, P518-523 In crystalline terrains, the best locations for-wells are in narrow, deeply fractured and altered belts, normally associated with fault zones or folding axes. An electrical procedure, based on vertical soundings and multiple resistivity profiles, has been used to map these essentially 2-dimensional structures in Brazil. Detailed description of the lateral and vertical extent of these fractured aquifers and some hydrological properties can be obtained. Data acquisition and data processing using a finite difference algorithm are described.
D 199t Pergamon Press plc. Reproduction not permitted